Heavy-ion storage rings can be employed for nuclear astrophysics studies. Over the last two decades the experimental storage ring ESR at GSI has played a central role for such investigations. Experimental possibilities will be extended with the commissioning of the low-energy storage ring CRYRING, which is being constructed presently downstream of the ESR. The idea of this collaboration is to combine resources, create synergies and coherently present the latest developments concerning the experimental determination of nuclear properties with astrophysical motivation at storage rings.